This is one of those web log pages that includes information discussing matters that I deem relevant from my personal experiences. It is also what I do when I should be doing physics homework, but am not.

Saturday, October 16, 2010

I thought I'd have some fun seeing what the "radical left" are portrayed as doing. Since, as far I'm concerned, this means a groups of (American) liberals who are so far into their own idealistic view that they've lost touch with reality, the sort of legislation and worldview they champion should be comical and obviously nonsensical.

So, what I'm going to do here is compare what political action groups and the like have to say about them, and then refute with a true comical exaggeration of what would more accurately describe the sort of group they think they'd be referring to in a way of re-shaping our current cultural norms. Obviously I can't do this on my own and would LOVE to get support from other blogs in order to shape the way the issues are portrayed.

Serving in the military is a privilege and an honor, not a right.If someone has poor eyesight or cannot pass a physical fitness exam, they are not allowed to serve in the armed forces, no matter how badly that individual might want to be in the military.Strict standards and, quite necessarily, the discrimination against/rejection of those who cannot meet those standards, keep the military strong and ready to protect the country from both domestic and foreign threats.

The battle over whether or not homosexuals should be allowed to serve openly in the military was also fought back in 1993.The law does not allow service members to serve openly, and activists challenged this during the Clinton years in the same way they are challenging the law now.The “Don’t Ask Don’t Tell” compromise policy was put into place after numerous congressional hearings were held and it was determined that allowing homosexuals to serve openly would negatively affect military readiness.The law itself never changed.The radical left now wish to repeal the law.“Don’t Ask, Don’t Tell” is a way to ensure the military never finds out if a service member or potential service member has chosen to practice homosexuality and thus can avoid having to enforce the law.

Moderate liberals want to repeal the law because they see no reason why gay soldiers need to hide who they are and don't see how being interested in people of the same sex has any relation to competency as a soldier. Repealing DADT and allowing gays to openly serve removes stress for these soldiers serving, especially considering "don't ask" isn't always respected. Rather than worry about others in the organization looking through their personal belongings or correspondence in order to find evidence sufficient for rejection, they actually want military service to be based around merit.

The radical left wants to repeal the law so that they can make an army consisting solely of gay men and women whose first target will be the homophobes interested in treating them as second-class citizens or even advocating violence (such as corrective rape) against them.

The radical left takes the stance that, hell, we don't need a military at all! Everyone can live in peace and we can all share precious resources like oil together, which we all drink out of from a single communal cup. Yeah, since nobody drives around any more there's no need for oil except as a source of calories, and it turns out it apparently tastes pretty good -- at least some of the byproducts; one of the original developers of Vaseline (petroleum jelly) had a spoonful of it every day in order to stay healthy!

The radical left takes the stance that, hell, we should let other countries invade us to level the playing field! Why should get about 5 times the share of the worlds nonrenewable fuel supply as it relates to our population (5% of the world's population but 25% of the world's nonrenewable resources)? Let's give it to the rest of the world so that they can share in our economic benefits, thereby improving the worlds' economies and raising the standard of living across the board.

The radical left takes the position that while they're at it they may as well take our population! Why not start with our most productive workers? That way there won't be as large an amount of per-capita unemployment and we won't have to worry about immigrant workers being out-competed for low-wage jobs because there won't be anyone to compete with! Besides, that way the population of the world could spread out a little bit better and New York traffic won't continue to be bumper-to-bumper!

Do these positions sound crazy to you? Good! They ought to! Now, don't the claims of what the left wants to do that groups like CWA are making sound sane and worth supporting? I think they do!

Thursday, October 14, 2010

Ever wonder why division by zero causes your computers and calculators to vomit up all sorts of ridiculous error messages? Curious about why this "undefined" result was never defined?

Know the answer and are only reading this out of some sort of strange social obligation like what surely at least 85% of my audience probably is?

Well, then, read on, because I'm going to discuss the operation right now!

To understand why division by zero really screws things up, we're going to have to take a quick review of some of the lessons you might have gone over in some of your algebra classes.

First of all, what's division? Division is a basic mathematical operation. Its primary purpose to find a number that represents the number of items that are put into each of a certain number of groups out of a larger "pool". For example, if we have 8 bags of candy and four people to give them out to, we end up with 2 bags of candy per person; 8 divided by 4 is 2. (Sometimes we like to shorten this, and just write it as "8/4=2" for simplicity.) Because of the way division families work, we can also figure out how many people we can give out 2 bags of candy to if we have 8 bags -- this is 8 divided by 2, or 4.

This is due to the commutative property of multiplication, actually. It turns out that the process of division is the inverse operation of multiplication -- which we use to find, given a certain number of groups of something, how much of that thing we have. For example, if I have 3 goldfish each in 5 different fish tanks, I have 15 goldfish because 3 times 5 is 15 (3*5=15). When we say that multiplication is "commutative" (or that the operation "commutes") it means that the two numbers on the left hand side of our mathematical statement can be interchanged to give us the same result -- 3*5=15 and 5*3=15.

You might note that commutativity applies not only to multiplication but also to addition. This might not surprise you if you've realized that multiplication itself is really just adding in groups. So we can represent 3*5 as 3+3+3+3+3. Heck, we could also represent it as 5+5+5. This is a very useful matter to keep in mind, as it makes it easy to clean up messy algebra that we might end up working with in a more complicated setting. The realization of the commutativity is pretty clear when switching, say, the first and second 5s in that last expression gives you the same result that you started with.

Thus, if division tells us the total number of y objects in z groups is x, then multiplication tells us that having x objects each in groups of y gives us z objects. In a symbolic representation, we'll describe this as such: x*y=z can be reversed as z/y=x. Note that since we can switch x and y, then the other two symbolic statements in this "factor family" are y*x=z and z/x=y.

So, what does this have to do with why division by 0 causes errors?

Well, let's have n represent this otherwise undefined result from a division by zero operation. Just to make it easier to follow we'll choose a specific number to divide by zero -- I like 7. Thus we're assuming that 7/0=n.

If we go back to our knowledge that division and multiplication are inverses, we find that the above statement implies that n*0=7. That means that we're adding a number no times (i.e, we're not adding anything at all!) and somehow ending up with 7. Or that I've added nothing n times and ended up with 7. Going back to our conceptual representations, that's like me going with my 1 gallon bucket to the well, coming back with it empty, and somehow having brought 7 gallons of water to my village.

That's why we won't try to shoehorn a definition for division by zero! It doesn't make physical sense! If we allow for it in our modeling of physics we can allow for division by zero, then we're allowing for things like the spontaneous creation of matter and instantaneous teleportation! Considering we don't really see this happening (definitely not on a macroscopic scale, anyway), it seems that treating the result of division by zero as "any old number" is conceptually worthless to us.

If we try to do algebra with it, our equations will also, in a manner of speaking, blow up in our faces -- more precisely we'll lose some information in possible values that our expressions can take. If we divide by x in solving an algebraic statement, we're implicitly assuming that x can't be zero. If x can be zero, doing this is going to cause us to end up missing that solution and possibly others. Consider (x-5)*x = 0. If we divide by x then x has to equal 5. But x could be zero, so we miss out on that solution.

But I know what someone out there is saying -- what if instead of 7, we use zero? Well, that's a good point -- and it IS a distinct concept. Then we have 0/0=n. If we go and rewrite this, then we have n*0=0. This is valid -- in fact, you'll note that n can be anything, and this will still be valid.

That's actually the problem. We can plug in anything for n and it'll work. Thus 0/0 doesn't give us a single number; it effectively gives us every number. This is bad for algebra. We don't call this "undefined"; since we can define 0/0 to be anything we call it an indeterminate form. (Basically, so-called because we can't determine a single number that 0/0 represents.)

What this means is that from 0/0 you can pretty much get anything. If you're doing some mathematical test and you find a 0/0 as a result, that means that you can't conclude anything about the expression which you're testing, and will need to use another test.